Operating Manual Vol 1 - ES Documentation

SMIQDigital Standard 3GPP W-CDMA (FDD)2.14.2.9 WCDMA/3GPP Menu – Display of Code Domain and Code DomainConflictsThe channelization codes are taken from a code tree (see below).The greater the spreading factor, the smaller the symbol rate and vice versa. The product of the spreadingfactor and the symbol rate is constant and always equals the current chip rate. The outer branches of thetree (right-most position in the figure) give the channelization codes for the lowest symbol rate (and so thehighest spreading factor). The use of a channelization code from the level with a spreading factor N blocksthe use of all other channelization codes from levels with spreading factor >N in the same branch of thecode tree. Channelization codes with a smaller spreading factor are contained in the codes with largerspreading factor in the same code branch. If channelization codes of this type are used at the same time,the signals of associated code channels will be mixed up to such an extent that they could not beseparated in the receiver and orthogonality would be lost.Fig. 2-126Code tree of channelization codesExample: If in Fig. 2-126 code c 2,1 is already used, the remaining branch is blocked with c 4,1 and c 4,2 .The outer branch region (with minimum symbol rate and max. spreading factor) which is based on thechannelization code selected in the code tree is defined as the domain of a certain channelization code.Using a channelization code means that its entire domain is used. The whole domain ranges from 0 to511 at the chip rate of 3.84 Mcps:Chip _ rate 3.84Mcps=−1= −1)min_ symbol _ rate 7.5kspsA graphic is displayed with the CODE DOMAIN menu item or the STATUS hardkey. This graphic showsthe occupancy of the code domain by the active code channels.Fig. 2-127WCDMA/3GPP – BS CONFIGURATION / CODE DOMAIN menu (without conflict)1125.5555.03 2.211E-9